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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Cyanide works by making the human body unable to use oxygen.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.